Hi
It's amazing that the blank PCB was made available as a separate item. Imagine the amount of labour involved in building the LTB/PSU from scratch including transferring over all the components from the damaged PCB. Us vintage people would love the challenge
but surely, it wouldn't be viable in the trade, cheaper to supply a replacement LTB unit complete.
On the same lines, I bet they offered a blank CDA PCB to replace the toasted one but with the proviso that stand off valve holders only must be fitted.
Regards
Symon.